Planning & EstimatingQuestion 308 of 360
A plan symbol shows a circle with the letters "CO" next to a drain line at grade. What does this indicate?
a.A cleanout at that location
b.A carbon-monoxide alarm
c.A cold-only faucet
d.A concrete opening
Explanation
"CO" on a drainage line marks a cleanout, an access fitting for rodding the line. Recognizing the cleanout symbol lets you count them for the takeoff and verify code-required locations. Confirm the abbreviation on the plan legend, since "CO" can mean different things on other discipline drawings.
Practice all 360 questions free — no signup required.
Related questions on this topic
- When exactly is the final plumbing inspection normally performed?
- On a gas piping plan, a note reads "2 PSI system." For planning, what does this primarily affect?
- A two-story building has identical bathroom stacks on floors 1 and 2. The floor-to-floor height is 10 feet. Estimating vertical pipe for one stack from the first-floor drain to the second-floor branch, roughly how much vertical footage should you count?
- Why do estimators apply a difficulty or productivity factor to base labor units on some jobs?
- On a plumbing plan, what does a "point of connection" (POC) note typically identify?
- When must a plumbing permit generally be obtained relative to starting the work?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review